user
Explain the differences between a formal and an informal letter.


assistant
Formal letters are written for professional or business purposes and use formal language, whereas informal letters are written for personal communication and can contain informal language. Formal letters use a fixed format or style, use polite language, and avoid using contractions or abbreviations. Informal letters are typically written in a conversational style and may include slang or abbreviations. Formal letters should use the third person, whereas informal letters may use the first or second person. Formal letters include a signature line, while informal letters typically do not. Formal letters often include a closing line, such as "Sincerely," while informal letters may end more casually with phrases such as "Take care," or "Love."